时频峰值滤波调频指数的斜率变换法  

The Slope Scaling of Modulated Index in Time-Frequency Peak Filtering

作　　者：康宇璇 刘怀山[1] Kang Yuxuan;Liu Huaishan(Key Lab of Submarine Geosciences and Prospecting Technologies,Ocean University of China, Qingdao Shandong 266100,China)

机构地区：[1]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《工程地球物理学报》2018年第2期200-206,共7页Chinese Journal of Engineering Geophysics

基　　金：国家高技术研究发展计划863项目(编号:2013AA092501)

摘　　要：相较于前人在时频峰值滤波(Time-Frequency Peak Filtering)中以常数表示的调制指数,为进一步明确该参数的作用及选取方向,从其物理意义出发提出了一种基于信号自身线性部分极值的估计方法。本质上来说当所求信号在时域内是线性变化时,时频峰值滤波法能有效地消除加性高斯白噪并保留有用信号。计算结果显示在信噪比相对较高的情况下与现有方法相比,基于线性极值估计方法的斜率变换法算例提供了良好的滤波效果,且证明计算效率与已有方法相当。为时频峰值滤波更好地在地震资料处理上应用提供了一种可供选择的途径。For better understanding of affection of the parameter modulated index on time-frequency peak filtering(TFPF),a signal-based modulated index estimated method has been proposed based on its physical meaning,which is built upon the extrema of linear part of the signal instead of a constant before in TFPF.Basically,TFPF is mainly aimed at decreasing additive white Gaussian noise and meanwhile maintains desired signal information as much as possible,when linear variation is one of valuable signal's characteristics.Compared with the existed method under relatively high SNR condition as calculated results showed,this slope scaling method gives a decent outcome and a matched calculated efficiency,which provides another choice while processing seismic record using TFPF for data analysist.

关 键 词：时频峰值滤波 调频分析 地震信号 调制指数 斜率变换 

分 类 号：P631.4[天文地球—地质矿产勘探]